To find X% of a number, multiply the number by \(\displaystyle\frac{{X}}{{100}}\). If n is 150% of 40, then:
\(\displaystyle{\left(\frac{{150}}{{100}}\right)}\cdot{40}={n}\)

\(\displaystyle\frac{{6000}}{{100}}={n}\)

60=n

or

n=60

\(\displaystyle\frac{{6000}}{{100}}={n}\)

60=n

or

n=60